JavaScript中"any"是否为标准关键字？"any"关键字是什么？

Hey there! Let's clear up this confusion once and for all.

First off: No, any is not a standard keyword in JavaScript (ECMAScript).

The official ECMAScript specification defines a fixed set of keywords (like if, else, function, return, const, etc.) that have special meaning to the JS engine. any isn't on that list—you can even use it as a regular variable name in pure JavaScript without any syntax errors:

let any = "I'm just a regular variable!";
console.log(any); // Works perfectly fine

So where does the confusion come from? If you've seen any used in code related to JavaScript, it's almost certainly from TypeScript—a typed superset of JavaScript. In TypeScript, any is a special type annotation that tells the compiler to skip type checking for a value. It lets you assign any type of value to a variable without triggering type errors:

let flexibleValue: any = "Start as a string";
flexibleValue = 123; // Switch to a number—no TS error
flexibleValue = { key: "value" }; // Or an object—still okay

TypeScript is widely used alongside JavaScript, so it's easy to mix up its features with pure JavaScript syntax. But remember: in standard JS itself, any has no special keyword status.

内容的提问来源于stack exchange，提问作者SebS